<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

</head>
<body>
    <script>
        function Person(name){
            this.name = name;
        }
        Person.prototype.say = function(){
            console.log('hello');
        }
        function Student(name,age){
            Person.call(this,name);
            this.age = age
        }
        Student.prototype = new Person()
        Student.prototype.constructor = Student

        
    </script>
</body>
</html>